4 ms·
That's my thought. I counted about 12 seconds between initial explosion and the sound hitting the camera, which puts it at roughly 2.88km away. Edit: Helps if
by daeken 10y ago
That's my thought. I counted about 12 seconds between initial explosion and the sound hitting the camera, which puts it at roughly 2.88km away.
Edit: Helps if I multiply properly. 12 seconds * 340m/s == 4080m.
- anigbrowl 10y ago15, 5k
- lucretian 10y agoi think you mean 4.1 km?
- daeken 10y agoYeah, I typoed the math -- used 240m/s rather than 340m/s for the speed of sound.
- jychang 10y agoOk, the Falcon 9 1.2 [1] is 70m tall [2], and the rocket fills up about 80% of the vertical frame [3]. Using the "Image = FL * Obj / distance" equation, we get: .8 * 24mm = x * 70m/4080m Where x is the focal length of the lens assuming a full frame camera. This comes out to a x = 1119mm equivalent focal length. If you have a crop sensor, this isn't too hard to obtain. I'd be amused if the video was taken with a Canon EF 1200mm lens or something, but the probability of that is 0. [1] https://en.wikipedia.org/wiki/Amos-6 https://en.wikipedia.org/wiki/Amos-6 [2] https://en.wikipedia.org/wiki/Falcon_9_Full_Thrust https://en.wikipedia.org/wiki/Falcon_9_Full_Thrust [3] https://www.youtube.com/watch?v=_BgJEXQkjNQ#t=1m10s https://www.youtube.com/watch?v=_BgJEXQkjNQ#t=1m10s
- tobz 10y agoCould be a teleconverter in the mix... or a Coolpix P900. :P